so, i thought at first that Parker just used his phone device to read isla's mind, but apparently he is inherently psychic.
i think a good way with revealing it would have been to show the powers start manifesting themselves over time, like cups and junk start twitching while he's around

Kids aren't stupid, true. On the other hand, kids also don't have a lot of knowledge and life experience to draw on. And what sort of life experience <i>do</i> the kids have to draw on? Well, Mom's been able to turn into a fox <i>all their lives</i>. So maybe the kids think that's <i>normal</i>—they don't see anything weird about it—and they don't mention it to anybody, the same way they don't mention "Hey! Water is wet!" to anybody?